AUX EL Series Instructions d'exploitation Page 40

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09/11/2014 38 NI401
Compressor bypass – initial installation or special requirement to heat with AUX EL only.
Special configuration, mode B and SW OVER = 0 only.
1. Pull yellow wire at ICM Y tab, or configure stat to 2H/1C or 2H/2C and follow wiring instructions on
NH401.
2. Jumper stat W to W2 tab.
3. Stat W will set blower to high, AUX EL steps on to full (may take time between stages, especially first time
on) but no compressor.
4. Return to normal (stat off when re-wiring) – remove W to W2 and replace yellow wire at ICM Y tab.
Troubleshooting – General
Troubleshooting Guide for Water-to-Air Geo “Heating”
Head
pressure
Subcool Suction
pressure
Superheat Compressor
Amp Draw
Air temp
differential
Source temp
differential
Undercharged system Low Low Low High Low Low Low
Overcharged system High High High Low High High High
Low air flow High Low High High High High Low
High air flow Low Low High High High Low High
Low source flow Low High Low Low Low Low High
High source flow High Low High High High High Low
Low return air
temperature
Low High Low Low Low High High
High return air
temperature
High Low High High High Low Low
Scaled source coil Low High Low Low Low Low Low
Restricted filter/drier Low High Low High Low Low Low
Bad TXV / No Bulb
charge
Low High Low High Low Low Low
Troubleshooting Guide for Water-to-Air Geo “cooling”
Head
pressure
Subcool Suction
pressure
Superheat Compressor
Amp Draw
Air temp
differential
Source temp
differential
Undercharged system Low Low Low High Low Low Low
Overcharged system High High High Low High Low Low
Low air flow Low High Low Low Low High Low
High air flow Low Low High High High Low High
Low source flow High Low High High High Low High
High source flow Low High Low Low Low High Low
Low return air
temperature
Low High Low Low Low Low Low
High return air
temperature/Humidity
High Low High High High Low High
Scaled source coil High Low High High High Low Low
Restricted filter/drier Low High Low High Low Low Low
Bad TXV / No Bulb
charge
Low High Low High Low Low Low
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